/**************************************************************************/
/*  EOSP                                                                  */
/*                                                                        */
/*  Copyright (c) 2013-2019                                               */
/*  All rights reserved.                                                  */
/*                                                                        */
/*  This project was developed by the SJQU Computer Department as part    */
/*  of the course 'Embedded Operation System Practice'.                   */
/*                                                                        */
/*  Redistribution and use in source and binary forms, with or without    */
/*  modification, are permitted provided that the following conditions    */
/*  are met:                                                              */
/*  1. Redistributions of source code must retain the above copyright     */
/*     notice, this list of conditions and the following disclaimer.      */
/*  2. Redistributions in binary form must reproduce the above copyright  */
/*     notice, this list of conditions and the following disclaimer in    */
/*     the documentation and/or other materials provided with the         */
/*     distribution.                                                      */
/*                                                                        */
/*  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''    */
/*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED     */
/*  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A       */
/*  PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR   */
/*  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,          */
/*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES /INCLUDING, BUT NOT      */
/*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF      */
/*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION/ HOWEVER CAUSED AND   */
/*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,    */
/*  OR TORT /INCLUDING NEGLIGENCE OR OTHERWISE/ ARISING IN ANY WAY OUT    */
/*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF    */
/*  SUCH DAMAGE.                                                          */
/**************************************************************************/
#ifndef __APP_DATABUF_H__
#define __APP_DATABUF_H__

#define DATABUF_DEFAULT_SIZE  (1024)

struct databuf_typedef;
typedef void (*databuf_peek_ptf)(struct databuf_typedef *databuf, char *peekbuf, int len);
typedef void (*databuf_read_ptf)(struct databuf_typedef *databuf, char *readbuf, int len);
typedef void (*databuf_write_ptf)(struct databuf_typedef *databuf, const char *writebuf, int len);
typedef void (*databuf_reset_ptf)(struct databuf_typedef *databuf);
typedef int (*databuf_dbsize_ptf)(struct databuf_typedef *databuf);

typedef struct databuf_typedef {
  int size;
  int head, tail;
  databuf_peek_ptf peek;
  databuf_read_ptf read;
  databuf_write_ptf write;
  databuf_reset_ptf reset;
  databuf_dbsize_ptf dbsize;
  char *data;
} databuf_t, *databuf_pt;

databuf_pt create_databuf(void);
void destroy_databuf(databuf_pt);


#endif

